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Thyronectria ilicicola
Nomenclature
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Family: NectriaceaeGenus: Thyronectria
SUMMARY
Stromata smooth or sometimes cerebriform, erumpent through the host epidermis, orange to dark brown.
Anamorph: Zythiostroma-like. Conidiomata immersed in stromatic tissue, sometimes interspersed with ascomata, solitary or clustered in small groups, 35–210 μm high × 40–260 μm diam. Conidiomatal wall 5–15 μm thick, composed of angular cells. Conidiophores densely branched, 15–25 μm x 1.4–2.6 μm. Conidiogenous cells 5–14 × 1.0–2.5 μm, cylindrical to subulate, proliferating percurrently. Conidia (2.3–) 3.0–4.0 (–4.6) × (0.9–) 1.2–1.8 (–2.4) μm, ellipsoidal to cylindrical, sometimes slightly curved, aseptate, hyaline [data from Hirooka et al. 2012].
Teleomorph: ascomata perithecia, superficial on well-developed stromata, aggregated in groups of 3–30, 250–400 μm high and 180–400 μm diam., subglobose to globose, slightly cupulate upon drying, sometimes with only a depressed apical region, reddish brown to scarlet, the apical region slightly darker, dark red in KOH, yellow in lactic acid, the surface often scurfy, yellow to yellowish green, sometimes scaly with the deposits sometimes completely obscuring the coloration of the ascoma. Ascomatal wall with an outer layer of globose to angular cells and an inner layer of ± hyaline flattened tissue. Asci 68-80 × 6.9–8.7 (-10) μm, cylindrical to cylindric-clavate, thin-walled, mostly short-stalked, the apex rounded to truncate with an inconspicuous apical ring, not blueing in iodine, 8-spored. Ascospores uniseriate, (9.6-) 10.4–13.1 (-14.0) × 4.8–5.8 μm, cylindric-ellipsoidal, slightly constricted at the median septum, hyaline to pale yellow, smooth to slightly roughened, fairly thin-walled, without a gelatinous sheath or appendages, not budding in the asci.
Description adapted in part from Hirooka et al. (2012).